Construction of Reverse Type-II InP/Zn x Cd 1- x S Core/Shell Quantum Dots with Low Interface Strain to Enhance Photocatalytic Hydrogen Evolution
The InP-based quantum dots (QDs) have attracted much attention in the field of photocatalytic H evolution. However, a shell should be used for InP-based photocatalytic systems to passivate the numerous surface defects. Different from the traditional InP-based core/shell QDs with Type-I or Type-II ba...
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Veröffentlicht in: | Inorganic chemistry 2024-07, Vol.63 (27), p.12582-12592 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The InP-based quantum dots (QDs) have attracted much attention in the field of photocatalytic H
evolution. However, a shell should be used for InP-based photocatalytic systems to passivate the numerous surface defects. Different from the traditional InP-based core/shell QDs with Type-I or Type-II band alignment, herein, the "reverse Type-II" core/shell QDs in which both the conduction and valence bands of shell materials are more negative than those of core materials have been well-designed by regulating the ratio of Cd/Zn of the alloyed Zn
Cd
S shell. The reverse Type-II band alignment would realize the spatial separation of photogenerated carriers. More importantly, the photogenerated holes tend to rest on the shell in the reverse Type-II QDs, which facilitate hole transfer to the surface, the rate-determining step for solar H
evolution using QDs. Therefore, the obtained InP/Zn
Cd
S core/shell QDs exhibit superior photocatalytic activity and stability under visible light irradiation. The rate of solar H
evolution reaches 376.19 μmol h
mg
at the initial 46 h, with a turnover number of ∼2,157,000 per QD within 70 h irradiation. |
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ISSN: | 0020-1669 1520-510X |
DOI: | 10.1021/acs.inorgchem.4c01503 |